package com.huoshan.im.server.config;

import com.huoshan.im.server.config.properties.SettingConfig;
import com.huoshan.im.server.executor.VisibleThreadPoolTaskExecutor;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * 说明：配置线程池
 *
 * @author 火山九日
 * @date 2020/6/3 16:13
 */
@Slf4j
@AllArgsConstructor
@Configuration
@EnableAsync
public class ExecutorConfig {

    private final SettingConfig properties;

    @Bean("asyncExecutor")
    public Executor asyncExecutor() {

        ThreadPoolTaskExecutor executor = new VisibleThreadPoolTaskExecutor();
        // 配置核心线程数
        executor.setCorePoolSize(properties.getExecutorConfig().getCorePoolSize());
        // 配置最大线程数
        executor.setMaxPoolSize(properties.getExecutorConfig().getMaxPoolSize());
        // 配置队列大小
        executor.setQueueCapacity(properties.getExecutorConfig().getQueueCapacity());
        // 配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix(properties.getExecutorConfig().getThreadNamePrefix());

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 线程空闲后存活时间（单位：秒）
        executor.setKeepAliveSeconds(properties.getExecutorConfig().getKeepAliveSeconds());
        // 执行初始化
        executor.initialize();
        return executor;
    }
}
